Add language settings for users, and translate titles to French

app/views/users/_form.html.slim

@@ -1,6 +1,7 @@
 = form_with model: user, method: method do |form|
   - if method == :patch
     h4 General settings
+  
   .row.mb-3
     .col
       .input-group
@@ -8,11 +9,20 @@
         .form-floating
           = form.text_field :username, autocomplete: "off", class: "form-control"
           = form.label :username, class: "required"
+
   .row.mb-3
     .col
       .form-floating
         = form.text_field :email_address, autocomplete: "off", class: "form-control"
         = form.label :email_address, class: "required"
+
+  .row.mb-3
+    .col
+      .form-floating
+        = form.select :lang, Languages::AVAILABLE_LANGUAGES.map { |lang| [ lang[:name], lang[:id] ] }, {}, class: "form-select"
+        = form.label :lang
+          | Language
+
   - if method == :post
     .row.mb-3
       .col
@@ -23,6 +33,7 @@
 
   - if method == :patch
     h4.mt-5 Change password
+
     = form_with model: user, method: method do |form|
       .row.mb-3
         .col